Highly enantioselective Michael addition of acetone to nitroolefins catalyzed by chiral bifunctional primary amine-thiourea catalysts with acetic acid
作者:Qing Gu、Xing-Tao Guo、Xin-Yan Wu
DOI:10.1016/j.tet.2009.04.087
日期:2009.7
Highly enantioselective Michael reaction of acetone with a variety of nitroolefins catalyzed by N-[(1R,2R)-2-aminocyclohexyl]-N′-(2,3,4,6-tetra-O-acetyl-β-d-glucopyranosyl)-thiourea (1b) together with acetic acid is described. The Michael addition products were obtained in high yields (76–94%) and up to 96% ee.
N -[(1 R,2 R)-2-氨基环己基] -N '-(2,3,4,6-四-O-乙酰基-β- d催化的丙酮与多种硝基烯烃的高度对映选择性迈克尔反应描述了-吡喃葡萄糖基)-硫脲(1b)与乙酸。迈克尔加成产物的收率很高(76-94%),ee最高可达96%。